1265873730 has 128 divisors (see below), whose sum is σ = 3405701376. Its totient is φ = 298521600.

The previous prime is 1265873723. The next prime is 1265873731. The reversal of 1265873730 is 373785621.

It is a super-2 number, since 2×1265873730² = 3204872600608225800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1265873731) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2745700 + ... + 2746160.

It is an arithmetic number, because the mean of its divisors is an integer number (26607042).

Almost surely, 2^1265873730 is an apocalyptic number.

1265873730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265873730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1702850688).

1265873730 is an abundant number, since it is smaller than the sum of its proper divisors (2139827646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265873730 is a wasteful number, since it uses less digits than its factorization.

1265873730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 1265873730 is about 35579.1192977004. The cubic root of 1265873730 is about 1081.7580334813.

The spelling of 1265873730 in words is "one billion, two hundred sixty-five million, eight hundred seventy-three thousand, seven hundred thirty".